One prediction of several Lorentz-invariance-violating quantum gravity theories is a dependence of the speed of light on photon energy. Any deviation from a constant speed of light must be extremely ...

Measurement invariance is a fundamental property of educational assessments that ensures a given test or scale measures the intended construct consistently across different student groups, cultural ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. The greatest scientific legacy that Albert Einstein left us is this: ...

A group of mathematicians has shown that at critical moments, a symmetry called rotational invariance is a universal property across many physical systems. For more than 50 years, mathematicians have ...

Learn about the standard model of particle physics, the most accurate physical theory yet. Our laws of physics are equations of motion, along with some associated constants. We’ve talked about the ...

Where were we? Ah yes, spontaneous symmetry breaking. When some field takes on a nonzero value even in empty space, and that field is affected by some symmetry transformation, the resulting symmetry ...

Breathe. As your lungs expand, air fills 500 million tiny alveoli, each a fraction of a millimeter across. As you exhale, these millions of tiny breaths merge effortlessly through larger and larger ...